public static Criterion From(MemberExpression expression)
{
if (expression.NodeType != ExpressionType.MemberAccess)
{
return(null);
}
if (expression.GetPropertiesInPath().LastOrDefault()?.Name == "HasValue" &&
expression.Expression is MemberExpression memberExpression)
{
var nullableProperty = memberExpression.GetDatabaseColumnPath();
return(new Criterion(nullableProperty, FilterFunction.IsNot, value: null));
}
var property = expression.GetDatabaseColumnPath();
if (property.IsEmpty())
{
return(null);
}
if ((expression.Member as PropertyInfo).PropertyType != typeof(bool))
{
return(null);
}
// Only one property level is supported:
return(new Criterion(property, FilterFunction.Is, true));
}
public static string GetDatabaseColumnPath(this MemberExpression memberInfo)
{
var path = memberInfo.GetPropertiesInPath();
if (path.None())
{
return(null);
}
if (path.ExceptLast().Any(x => !x.PropertyType.Implements <IEntity>()))
{
return(null);
}
return(path.Select(GetColumnName).ToString("."));
}
